Juno Probe Will Run Hellish Radiation Gauntlet at Jupiter Monday

The Juno spacecraft's long-awaited arrival at Jupiter Monday (July 4) will be a baptism by fire. If all goes according to plan Monday night, Juno will slip into orbit around the giant planet and get its first taste of the solar system's most intense radiation environment — a region where huge swarms of electrons are accelerated to nearly the speed of light by Jupiter's magnetic field, which is 20,000 times more powerful than Earth's. "Once these electrons hit a spacecraft, they immediately